Geospatial tools

http://www.geogreeting.com/main.html create greetings, like Hi World from satellite views of buildings that look like letters. Fun to explore

http://www.historypin.com/ combine maps with historical images.

http://animaps.com Create trips on Google Earth maps pinning points, tracking time and entering text

http://www.google.com/earth/download/ge/ Google Earth

http://sketchup.google.com/ Google Sketchup